I have a very similar experience to yours stillmoving, though I never was involved with txp.
Would be interested to hear what problems, if any, you found when moving from EE and what you did to solve them...
Was there anything that was particularly different or difficult?
The 'problems', if you can call them that, is my noob PHP status
. I keep a lot of Coda clips handy because I can remember everything. PW does nearly everything out of the box that EE + X amount of add-ons does. There are some aspects to building a site in PW that are 'harder' like categories and tags but PW offers a different and, without doubt, more robust and useful way of accomplishing that through PageListSelect.
I've put sites together in EE with page-tree type add-ons which takes users away from the entries list pane and into a pseudo tree-like structure. It's so easy to screw up an entire site. PW's pages hierarchy takes away any confusion and just makes sense. From there, as you know, you can not only pick and choose what pages you present through the API.
The other great aspect to PW is the community right here. I haven't come across one so accommodating and friendly in a long time. The only other one I can think of that's comparable is the Luxology (3d) forums. It really does make a huge difference when learning new tools and knowing that you can post noobie questions and get helpful responses.